US11139930B2 - User equipment and method for performing repetition - Google Patents

User equipment and method for performing repetition Download PDF

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US11139930B2
US11139930B2 US16/536,176 US201916536176A US11139930B2 US 11139930 B2 US11139930 B2 US 11139930B2 US 201916536176 A US201916536176 A US 201916536176A US 11139930 B2 US11139930 B2 US 11139930B2
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repetition
repetitions
user equipment
processor
base station
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US20200052828A1 (en
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Hai-Han WANG
Chun-Che CHIEN
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Institute for Information Industry
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/189—Transmission or retransmission of more than one copy of a message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1642—Formats specially adapted for sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1806—Go-back-N protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H04W72/042—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path

Definitions

  • the present disclosure relates to a user equipment and a method for performing repetition. More specifically, the present disclosure relates to a user equipment and a method capable of transmitting a plurality of repetitions in a time slot.
  • FIG. 1 depicts a schematic view of the conventional uplink repetition.
  • PUSCH physical uplink shared channels
  • the conventional uplink repetition is limited to that multiple repetitions cannot be transmitted in the same time slot. Therefore, as shown in FIG. 1 , when the user equipment transmits the uplink repetition R 1 in time points 106 and 107 of the time slot 10 , usually it has to transmit the uplink repetition R 2 in time points 116 and 117 of the time slot 11 . As a result, although the conventional uplink repetition may enhance the reliability of the wireless communication system, it also increases the system delay. In view of this, it is very important in the art to improve the conventional uplink repetition.
  • the present disclosure provides a user equipment.
  • the user equipment may comprise a processor and a transceiver electrically connected with the processor.
  • the processor may be configured to determine a repetition sequence comprising a plurality of repetitions.
  • the processor may also be configured to schedule the repetition sequence on a time slot or on a plurality of consecutive time slots, and at least one of the plurality of consecutive time slots is arranged to at least two of the plurality of repetitions.
  • the transceiver may be configured to transmit the plurality of repetitions to a base station.
  • the present disclosure also provides a method for performing repetition.
  • the method may comprise the following steps of:
  • the repetition sequence on a time slot or on a plurality of consecutive time slots, wherein at least one of the plurality of consecutive time slots is arranged to at least two of the plurality of repetitions;
  • the user equipment is configured to transmit a plurality of repetitions (at least two repetitions) in a time slot.
  • the embodiments realize decreasing the system delay while still maintaining the system reliability, and thus effectively improve the problem of the conventional uplink repetition mentioned above.
  • the aforesaid content is not intended to limit the present invention. Instead, the aforesaid content generally describes the technical problems that can be solved by the present invention, the technical means that can be adopted, and the technical effects that can be achieved, so that people having ordinary skill in the art can basically understand the present invention. People having ordinary skill in the art can further understand various embodiments of the present invention according to the attached figures and the content recited in the following embodiments.
  • FIG. 1 depicts a schematic view of the conventional uplink repetition.
  • FIG. 2 depicts a schematic view of a wireless communication system according to one or more embodiments of the present invention.
  • FIG. 3 depicts a schematic view of scheduling a repetition sequence according to one or more embodiments of the present invention.
  • FIGS. 4A-4C depicts schematic views of arranging a repetition when the symbol location corresponding to the repetition is unusable in a time slot according to one or more embodiments of the present invention.
  • FIGS. 5A-5C depicts schematic views of arranging a repetition when the repetition crosses a slot boundary according to one or more embodiments of the present invention.
  • FIGS. 6A-6D depicts schematic views of performing Redundancy Version (RV) mapping to a plurality of repetitions according to a preset rule, according to one or more embodiments of the present invention.
  • RV Redundancy Version
  • FIG. 7 depicts a schematic view of the user equipment terminating the remaining repetitions according to a hybrid automatic repeat request acknowledgement (HARQ ACK), according to one or more embodiments of the present invention.
  • HARQ ACK hybrid automatic repeat request acknowledgement
  • FIG. 8 depicts a schematic view of a plurality of repetitions corresponding to the same HARQ process according to one or more embodiments of the present invention.
  • FIG. 9 depicts a schematic view of a method for performing repetition according to one or more embodiments of the present invention.
  • FIG. 2 depicts a schematic view of a wireless communication system according to one or more embodiments of the present invention.
  • the contents shown in FIG. 2 are merely for explaining the embodiments of the present invention instead of limiting the present invention.
  • the wireless communication system 2 may be various a wireless communication system such as Long-Term Evolution (LTE) communication system or New Radio (NR) communication system.
  • the wireless communication system 2 may comprise one or more user equipment 21 , one or more base stations 22 and one or more core network (not shown).
  • Each of the user equipment 21 may basically comprise a processor 211 and a transceiver 212 electrically connected with the processor 211 .
  • the electrical connection between the processor 211 and the transceiver 212 may be direct connection (i.e., connection not via other elements) or indirect connection (i.e., connection via other elements).
  • the base stations 22 may be various types of base stations which are for example but not limited to: Macrocells, Microcells or Picocells or the like.
  • the architecture of the base stations 22 may comprise a Centralized Unit (CU) and/or one or more Distributed Units (DU).
  • the user equipment 21 may be various electronic devices supporting the wireless communication standards adopted by the wireless communication system 2 , which are for example but not limited to: mobile phones, tablet computers, laptop computers or the like.
  • the processor 211 may be a microprocessor or a microcontroller capable of signal processing.
  • the microprocessor or microcontroller is a programmable specific integrated circuit which is capable of operating, storing, outputting/inputting or the like and may receive and process various encoded instructions, thereby performing various logic operations and arithmetic operations and outputting corresponding operational results.
  • the processor 211 may be programmed to interpret various instructions so as to process data in the user equipment 21 and execute various operational procedures or programs.
  • the transceiver 212 may be constituted by a transmitter and a receiver, and may comprise for example but not limited to various communication elements such as an antenna, an amplifier, a modulator, a demodulator, a detector, an analog-to-digital converter, a digital-to-analog converter or the like.
  • the transceiver 212 may be configured to enable the user equipment 21 to communicate and exchange data with an external device. For example, as shown in FIG. 2 , the transceiver 212 of the user equipment 21 may communicate with the base station 22 , e.g., transmitting a plurality of repetitions R 1 , R 2 , . . . , Rn to the base station 22 .
  • FIG. 3 depicts a schematic view of scheduling a repetition sequence according to one or more embodiments of the present invention.
  • the contents shown in FIG. 3 are merely for explaining the embodiments of the present invention instead of limiting the present invention.
  • the processor 211 may be configured to determine a repetition sequence RS and a starting time point of the repetition sequence RS. Then, the processor 211 may determine the transmission occasions of the repetitions R 1 and R 2 according to the repetition sequence RS and two consecutive time slots 10 and 11 with their respective symbol allocations. Each of the time slots 10 and 11 comprises a plurality of time points, and each time point may represent the time length of a symbol. For example, as shown in FIG.
  • the processor 211 may determine the time points 102 , 103 , 104 and 105 as the transmission occasions of the repetition R 1 , and determine the time points 106 , 107 , 108 and 109 as the transmission occasions of the repetition R 2 . After determining the transmission occasions of the repetitions R 1 and R 2 , the processor 211 may further perform a redundancy version (RV) mapping to the repetitions R 1 and R 2 according to a redundancy version sequence.
  • RV redundancy version
  • the processor 211 may configure the first redundancy version “RV 0 ” for the transmission occasions of the repetition R 1 (i.e., the time points 102 , 103 , 104 and 105 ), and configure the second redundancy version “RV 2 ” for the transmission occasions of the repetition R 2 (i.e., the time points 106 , 107 , 108 and 109 ).
  • the transceiver 212 may transmit the repetition R 1 using the redundancy version “RV 0 ” to the base station 22 , and may transmit the repetition R 2 using the redundancy version “RV 2 ” to the base station 22 . Therefore, the user equipment 21 may transmit two repetitions in a time slot (i.e., the time slot 10 ), and may apply two redundancy versions in a time slot.
  • a transmission period of uplink transmissions of the wireless communication system 2 is configured to be twenty time points (i.e., two time slots)
  • the transceiver 212 transmits the repetitions R 1 and R 2 within a transmission period.
  • the transmission period is configured to be no more than eight time points (e.g., two, four, six or eight time points)
  • the transceiver 211 can transmit the repetitions R 1 and R 2 across multiple transmission periods.
  • the processor 211 may determine the repetition sequence RS and the starting time point of the repetition sequence RS according to a resource allocation of uplink transmissions which is received from the base station 22 in advance by the transceiver 212 .
  • the resource allocation may comprise for example but not limited to: a Starting symbol Length Indication Value (SLIV), a duration of the transmission period, a repetition number, one or more redundancy version sequences and so on, wherein the SLIV may indicate starting time point and the duration of repetitions.
  • SLIV Starting symbol Length Indication Value
  • the base station 22 may transmit a Radio Resource Control (RRC) message including the resource allocation to the transceiver 212 of the user equipment 21 .
  • RRC Radio Resource Control
  • the base station 22 may transmit Downlink Control Information (DCI) including the resource allocation to the transceiver 212 of the user equipment 21 , and in case the DCI cannot include the whole resource allocation, the base station 22 may provide the resource allocation in a collaborative way by transmitting an RRC message as well as the DCI to the transceiver 212 of the user equipment 21 .
  • DCI Downlink Control Information
  • the processor 211 may determine the duration of each repetition of the repetition sequence RS or the duration of the repetition sequence RS according to the SLIV and the repetition number.
  • the SLIV may comprise two parameters named “S” and “L”, which indicate that the starting time point of the repetition sequence RS is the “S th ” time point of the time slot and the duration of the repetition sequence RS includes “L” time points.
  • the processor 211 may determine that the duration of each of the repetitions includes
  • the parameter “L” may indicates that the duration of one repetition includes “L” time points while the parameter “S” still indicates that the starting time point of the repetitions sequence RS is the “S th ” time point of the time slot.
  • the processor 211 may determine a product of “L” and “repK” which still means the repetition number as the duration of the repetition sequence RS, and the starting time point of each repetition is the time point next to the ending time point of its previous repetition.
  • FIGS. 4A-4C depicts schematic views of arranging a repetition when the symbol location corresponding to the repetition is unusable in a time slot according to one or more embodiments of the present invention.
  • the contents shown in FIGS. 4A-4C are merely for explaining the embodiments of the present invention instead of limiting the present invention. The details will be described hereinafter with reference to the U.S. provisional application.
  • the repetition sequence RS comprises the repetitions R 1 and R 2 , each of which requires four time points to be transmitted.
  • the processor 211 may divide the repetition R 2 because some symbol location corresponding to the repetition R 2 is unusable in the originally scheduled time slot 10 .
  • the processor 211 may divide the repetition R 2 into two partitions, and transmit the former partition (i.e., a repetition R 21 ) of the repetition R 2 at the time points 106 and 107 of the time slot 10 , and transmit the latter partition (i.e., a repetition R 22 ) of the repetition R 2 at the time points 112 and 113 of the time slot 11 .
  • the processor 211 may divide a repetition and then drop the latter partition of the repetition when the symbol location corresponding to the repetition is unusable in a time slot. Taking FIG. 4A as an example, the processor 211 may only use the time points 106 and 107 for transmitting the former partition (i.e., the repetition R 21 ) of the repetition R 2 and drop the latter partition (i.e., the repetition R 22 ) of the repetition R 2 .
  • the repetition sequence RS comprises the repetitions R 1 , R 2 and R 3 , each of which requires two time points to be transmitted.
  • the processor 211 may postpone the repetition R 3 because the symbol location corresponding to the repetition R 3 is unusable in the time slot 10 (i.e., the time point 106 arranged to the semi-static flexible symbol F and the time point 107 arranged to the downlink symbol D).
  • the processor 211 may keep postponing the repetition R 3 as long as next symbol location is still unusable.
  • the processor 211 postpones the repetition R 3 thrice, since the time points 108 and 109 arranged to the downlink symbol D are unusable, and the time points 110 and 111 arranged to the downlink symbol D are unusable either. That is, the processor 211 may postpone the transmission occasions of the repetition R 3 from the time points 106 and 107 to the time points 112 and 113 .
  • the repetition sequence RS comprises the repetitions R 1 , R 2 and R 3 , each of which requires two time points to be transmitted.
  • the processor 211 may drop the repetition R 3 because the symbol location corresponding to the repetition R 3 is unusable in the time slot 10 and the number of postponement of the repetition R 3 has reached a threshold value.
  • a maximum number of postponement (e.g., two times) may be configured by the base station 22 and the user equipment 21 together, and the processor 211 may drop the repetition R 3 when the number of postponement of the transmission occasions of the repetition R 3 have reached the maximum number of postponement since the transmission occasions of the repetition R 3 were unusable during the postponement.
  • a parameter “maxTimeWindow” and a timer may be configured by the base station 22 and the user equipment 21 together, and the timer is activated when the repetition R 1 starts.
  • the processor 211 may drop the repetition R 3 , which is not transmitted due to the postponements.
  • the processor 211 may directly drop a repetition when the symbol location corresponding to the repetition is unusable in a time slot. Taking FIG. 4A as an example, the processor 211 may directly drop the repetition R 2 . Taking FIG. 4B as an example, the processor 211 may directly drop the repetition R 3 .
  • the transceiver 212 may receive an indication regarding whether to use the semi-static flexible symbols F in the uplink transmissions other than the initial transmission from the base station 22 , and the indication comprises the number of designated time slots and the number of semi-static flexible symbols F that are usable/unusable in the designated time slots.
  • the processor 211 may use other semi-static flexible symbols F than the first semi-static flexible symbol F after the downlink symbol D in the next time slot of the time slot in which the initial transmission (i.e., the first (set) of transmission occasion(s)) is transmitted. However, when the remaining transmission occasions span to the other time slots than the designated time slot, the processor 211 still uses only the uplink symbols U to perform the uplink transmissions except the initial transmission.
  • the indication may be transmitted from the base station 22 to the transceiver 212 via DCI.
  • the number of designated time slots and the number of semi-static flexible symbols F that are usable/unusable in the designated time slots may be transmitted from the base station 22 to the transceiver 212 via an RRC message. In some embodiments, the number of designated time slots may be transmitted from the base station 22 to the transceiver 212 via the RRC message, and the number of semi-static flexible symbols F that are usable/unusable in the designated time slots may be transmitted from the base station 22 to the transceiver 212 via the DCI. In some embodiments, the number of designated time slots and the number of semi-static flexible symbols F that are usable/unusable in the designated time slots may be transmitted from the base station 22 to the transceiver 212 via the DCI. The user equipment 21 uses the semi-static flexible symbol F for the uplink transmissions of the initial transmission according to the indication of the DCI when the symbol used for the initial transmission indicated by the DCI corresponds to the semi-static flexible symbol F.
  • the user equipment 21 when the user equipment 21 is configured to monitor the dynamic-SFI, then the user equipment 21 performs the uplink transmissions according to the dynamic-SFI in the time slot that is not indicated by the RRC message or the DCI if the user equipment 21 has monitored the dynamic-SFI, and the user equipment 21 only uses the uplink symbols U for uplink transmissions in the time slot that is not indicated by the RRC message or the DCI if the user equipment 21 has not monitored the dynamic-SFI.
  • the base station 22 must ensure that the format of the time slot indicated by the dynamic-SFI is consistent with the number of usable/unusable semi-static flexible symbol F indicated by the RRC message or the DCI.
  • the user equipment 21 when the uplink transmissions between the user equipment 21 and the base station 22 are based on the configured-grant transmission mode and the user equipment 21 is configured to monitor the dynamic-SFI, the user equipment 21 performs the uplink transmissions according to the dynamic-SFI if it has monitored the dynamic-SFI, and performs the uplink transmissions using only the uplink symbols U if it has not monitored the dynamic-SFI. In some embodiments, the user equipment 21 also performs the uplink transmissions using only the uplink symbols U if it is not configured to monitor the dynamic-SFI.
  • FIGS. 5A-5C depicts schematic views of arranging a repetition when the repetition crosses a slot boundary according to one or more embodiments of the present invention.
  • the contents shown in FIGS. 5A-5C are merely for explaining the embodiments of the present invention instead of limiting the present invention. The details will be described hereinafter with reference to the U.S. provisional application.
  • the repetition sequence RS comprises the repetitions R 1 and R 2 , each of which requires four time points to be transmitted.
  • the processor 211 may divide the repetition R 2 because the repetition R 2 crosses the slot boundary between the time slots 10 and 11 . That is, the processor 211 may divide the repetition R 2 into two partitions, transmit the former partition (i.e., the repetition R 21 ) of the repetition R 2 at the time points 107 and 108 of the time slot 10 , and transmit the latter partition (i.e., a repetition R 22 ) of the repetition R 2 at the time points 113 and 114 of the time slot 11 .
  • the former partition i.e., the repetition R 21
  • the latter partition i.e., a repetition R 22
  • the processor 211 may divide the repetition and then drop the latter partition of the repetition. Taking FIG. 5A for example, the processor 211 may transmit the former partition (i.e., the repetition R 21 ) of the repetition R 2 , and drop the latter partition (i.e., the repetition R 22 ) of the repetition R 2 .
  • the repetition sequence RS comprises the repetitions R 1 , R 2 and R 3 , each of which requires two time points to be transmitted.
  • the processor 211 may postpone the repetition R 3 because the repetition R 3 crosses the slot boundary between the time slots 10 and 11 .
  • the processor 211 may keep postponing the repetition R 3 as long as next symbol location is still unusable.
  • the processor 211 postpones the repetition R 3 thrice because the time points 111 and 112 arranged to the downlink symbol D are unusable, and the time points 113 and 114 arranged to the downlink symbol D are unusable either. That is, the processor 211 may postpone the transmission occasions of the repetition R 3 from the time points 109 and 110 to the time points 115 and 116 .
  • the repetition sequence RS comprises the repetitions R 1 , R 2 and R 3 , each of which requires two time points to be transmitted.
  • the processor 211 may drop the repetition R 3 when the repetition R 3 crosses the slot boundary between the time slots 10 and 11 .
  • a maximum number of postponement e.g., two times
  • the processor 211 may drop the repetition R 3 when the number of postponement of the transmission occasions of the repetition R 3 have reached the maximum number of postponement since the transmission occasions of the repetition R 3 crossed a slot boundary and/or the were unusable during the postponement.
  • a parameter “maxTimeWindow” and a timer may be configured by the base station 22 and the user equipment 21 together, and the timer is activated when the repetition R 1 starts.
  • the processor 211 may drop the repetition R 3 , which is not transmitted due to the postponements.
  • the processor 211 may directly drop a repetition when the symbol location corresponding to the repetition crosses a slot boundary. Taking FIG. 5A as an example, the processor 211 may directly drop the repetition R 2 . Taking FIG. 5B as an example, the processor 211 may directly drop the repetition R 3 .
  • the processor 211 may directly drop all or a part of a repetition when the time points for transmitting a Physical Uplink Control Channel (PUCCH) overlap with the transmission occasions of the repetition.
  • PUCCH Physical Uplink Control Channel
  • the transceiver 212 may receive DCI from the base station 22 , and the DCI indicates whether a DeModulation Reference Signal (DMRS) can perform Frequency Division Multiplexing (FDM) with the uplink data.
  • DMRS DeModulation Reference Signal
  • FDM Frequency Division Multiplexing
  • the transceiver 212 may receive an RRC message from the base station 22 , and the RRC message indicates whether a DMRS can perform Frequency Division Multiplexing (FDM) with the uplink data.
  • FDM Frequency Division Multiplexing
  • FIGS. 6A-6D depicts schematic views of performing Redundancy Version (RV) mapping to the plurality of repetitions according to a preset rule, according to one or more embodiments of the present invention.
  • RV Redundancy Version
  • the redundancy version sequence that the base station 22 configured to the user equipment 21 is “RV 0 RV 3 RV 0 RV 3 ”, and the processor 211 of the user equipment 21 configures the redundancy version RV 0 and the redundancy version RV 3 to the repetitions R 1 and R 2 respectively.
  • the processor 211 may configure the redundancy version which has been configured to a repetition to every partition divided from the repetition.
  • the processor 211 may configure the redundancy versions RV 0 _ 1 and RV 0 _ 2 to the repetitions R 11 and R 12 respectively, wherein the redundancy version RV 0 _ 2 is the subsequent bits of the redundancy version RV 0 _ 1 .
  • the processor 211 may configure the redundancy versions RV 3 _ 1 and RV 3 _ 2 to the repetitions R 11 and R 12 respectively, wherein the redundancy version RV 3 _ 2 is the subsequent bits of the redundancy version RV 3 _ 1 .
  • the redundancy version sequence that the base station 22 configured to the user equipment 21 is “RV 0 RV 3 RV 2 RV 1 ”, and the processor 211 of the user equipment 21 configures the redundancy version RV 0 , the redundancy version RV 3 , the redundancy version RV_ 2 and the redundancy version RV 1 to the repetitions R 1 , R 2 , R 3 and R 4 respectively.
  • the processor 211 may increase the number of usage of the redundancy versions RV 0 and RV 3 .
  • the repetition R 1 is divided into the repetitions R 11 and R 12
  • the repetition R 2 is divided into the repetitions R 21 and R 22
  • the repetition R 3 is divided into the repetitions R 31 and R 32
  • the repetition R 4 is divided into the repetitions R 41 and R 42 .
  • the processor 211 shall sequentially configure the redundancy versions RV 0 , RV 3 , RV 2 and RV 1 to the repetitions R 11 , R 12 , R 21 , R 22 , R 31 , R 32 , R 41 and R 42 , but, in order to increase the number of usage of the redundancy versions RV 0 and RV 3 , the processor 211 may respectively configure the redundancy versions RV 0 and RV 3 to any two consecutive repetitions. Taking FIG. 6B for example, the processor 211 may configure the redundancy versions RV 0 _ 1 and RV 0 _ 2 to the repetitions R 11 and R 12 respectively, wherein the redundancy version RV 3 _ 2 is the subsequent bits of the redundancy version RV 3 _ 1 .
  • the processor 211 may configure the redundancy version RV 2 to the repetition R 21 .
  • the processor 211 may configure the redundancy versions RV 3 _ 1 and RV 3 _ 2 to the repetitions R 22 and R 31 respectively, wherein the redundancy version RV 3 _ 2 is the subsequent bits of the redundancy version RV 3 _ 1 .
  • the processor 211 may configure the redundancy version RV 1 to the repetition R 32 .
  • the processor 211 may again configure the redundancy versions RV 0 _ 1 and RV 0 _ 2 to the repetitions R 41 and R 42 respectively.
  • the redundancy version sequence that the base station 22 configured to the user equipment 21 is “RV 0 RV 3 RV 2 RV 1 ”, and the processor 211 of the user equipment 21 configures the redundancy version RV 0 , the redundancy version RV 3 , the redundancy version RV_ 2 and the redundancy version RV 1 to the repetitions R 1 , R 2 , R 3 and R 4 respectively.
  • the processor 211 may configure the same redundancy version as the previous/next repetition (after division) to the repetition (after division) that has a high coding rate.
  • the processor 211 shall sequentially configure the redundancy versions RV 0 , RV 3 , RV 2 and RV 1 to the repetitions R 1 , R 21 , R 22 , R 31 , R 32 , R 41 and R 42 , but in order to reduce the problem of high coding rates, the processor 211 may configure the same redundancy version as the previous/next repetition (after division) to the repetition (after division) that has a high coding rate. Taking FIG.
  • the processor 211 may configure the redundancy version RV 0 _ 1 to the repetition R 1 , and configure the redundancy version RV 0 _ 2 to the repetition R 21 that has a high coding rate, wherein the redundancy version RV 0 _ 2 is the subsequent bits of the redundancy version RV 0 _ 1 . Then, the processor 211 may sequentially configure the redundancy versions RV 2 , RV 3 and RV 1 to the repetitions R 22 , R 31 and R 32 . Finally, the processor 211 may, again, configure the redundancy version RV 0 _ 1 to the repetition R 41 , and configure the redundancy version RV 0 _ 2 to the repetition R 42 that has a high coding rate.
  • the base station 22 configures four redundancy version sequences, i.e., “RV 0 RV 3 RV 2 RV 1 ”, “RV 2 RV 0 RV 3 RV 1 ”, “RV 3 RV 2 RV 0 RV 1 ” and “RV 2 RV 3 RV 1 RV 0 ”, to the user equipment 21 .
  • the processor 211 may select one of the four redundancy version sequences such that the redundancy version RV 0 is configured to the longest repetition. For instance, it is assumed that in the time slot 6 , the repetition R 1 is divided into the repetitions R 11 and R 12 , and the repetition R 2 is divided into the repetitions R 21 and R 22 .
  • the processor 211 may select the redundancy version sequence “RV 3 RV 2 RV 0 RV 1 ” and sequentially configure the redundancy versions RV 3 , RV 2 , RV 0 and RV 1 to the repetitions R 11 , R 12 , R 21 and R 22 , such that the redundancy version RV 0 is configured to the repetition R 21 , which is the longest among all repetitions.
  • FIG. 7 depicts a schematic view of the user equipment terminating the remaining repetitions according to a hybrid automatic repeat request acknowledgement (HARQ ACK), according to one or more embodiments of the present invention.
  • HARQ ACK hybrid automatic repeat request acknowledgement
  • the uplink transmissions between the user equipment 21 and the base station 22 are based on the configured-grant transmission mode.
  • the transceiver 212 performs uplink transmission UT at the time points t 0 -t 3 , and cannot monitor a Hybrid Automatic Repeat Request acknowledgement (HARQ-ACK) HA at the time points t 0 -t 3 since the transmissions at those time points are the first transmission of the uplink transmission UT.
  • the transceiver 212 may perform another uplink transmission UT at the time points t 7 -t 10 .
  • HARQ-ACK Hybrid Automatic Repeat Request acknowledgement
  • the transceiver 212 detects the HARQ-ACK HA transmitted from the base station 22 at the time points t 7 -t 8 , then the subsequent uplink transmissions UT scheduled to the subsequent time points (e.g., the time points t 14 -t 17 and t 21 -t 24 ) may be terminated according to the HARQ-ACK HA. However, the transceiver 212 will continue to perform the uplink transmission UT at the time points t 14 -t 17 if it does not detect the HARQ-ACK HA at the time points t 7 -t 8 .
  • the transceiver 212 detects the HARQ-ACK HA transmitted from the base station 22 at the time points t 14 -t 15 , then the subsequent uplink transmissions UT scheduled to the subsequent time points (e.g., the time points t 21 -t 24 ) may be terminated according to the HARQ-ACK HA. However, the transceiver 212 will continue to perform the uplink transmission UT at the time points t 21 -t 24 if it does not detect the HARQ-ACK HA at the time points t 14 -t 15 . With such a mechanism, the user equipment 21 may terminate the subsequent repetitions after receiving the confirmation for the uplink data, and therefore the power consumption and resource occupation may be reduced.
  • the HARQ-ACK HA can correspond to one or more HARQ process, and when the transceiver 212 receives the HARQ-ACK HA, the New Data Indicator (NDI) corresponding to the one or more HARQ process have been toggled and the processor 211 may stop the configured-grant timer (e.g., the parameter “configuredGrantTimer”) related to the one or more HARQ process according to the HARQ-ACK HA.
  • the configured-grant timer e.g., the parameter “configuredGrantTimer”
  • FIG. 8 depicts a schematic view of a plurality of repetitions correspond to the same HARQ process according to one or more embodiments of the present invention.
  • the contents shown in FIG. 8 are merely for explaining the embodiments of the present invention instead of limiting the present invention. The details will be described hereinafter with reference to the U.S. provisional application.
  • the user equipment 21 transmits a plurality of repetitions across a plurality of transmission periods, the user equipment 21 is not able to use the configured grant of the plurality of transmission periods to transmit the plurality of repetitions, since the HARQ process corresponding to the transmission occasions of each of the transmission periods are different, which also means that the HARQ process identifications (IDs) corresponding to the transmission occasions of each of the transmission periods are different.
  • the processor 211 may use the HARQ process ID corresponding to the first transmission period as the HARQ process ID of the subsequent transmission periods via defining an HARQ process bundle timer (e.g., a parameter named “HARQProcessBundleTimer”).
  • each time slot comprises seven transmission periods, wherein the duration of each transmission period includes two symbols, and each transmission period corresponds to one of the four HARQ process IDs ID 0 -ID 3 .
  • the processor 211 may perform an uplink transmission with the HARQ process ID ID 0 when the user equipment 21 does not perform repetition.
  • the user equipment 21 performs the repetition from the fifth transmission period to the eighth transmission period, and the HARQProcessBundleTimer defined by the processor 211 is activated at the fifth transmission period.
  • the repetitions other than the first repetition may still use the same HARQ process ID as the first repetition does, even if the configuredGrantTimer corresponding to the HARQ process ID of the first repetition is still running That is, the repetitions during the four transmission periods may be transmitted with the HARQ process ID ID 0 corresponding to the fifth transmission period.
  • the HARQProcessBundleTimer when the HARQProcessBundleTimer is running, it may express that an NDI of the HARQ process corresponding to the HARQProcessBundleTimer have not been toggled.
  • a repetition sequence is scheduled in a transmission period.
  • the base station 22 may configure a plurality of repetition sequence in a transmission period, wherein the starting time of the plurality of repetition sequence comprises a time offset, and when there is uplink data that needs to be transmitted, the user equipment 21 may choose the repetition sequence with the minimum waiting time to perform the uplink transmissions.
  • FIG. 9 depicts a schematic view of a method for performing repetition according to one or more embodiments of the present invention.
  • the contents shown in FIG. 9 are merely for explaining the embodiments of the present invention instead of limiting the present invention.
  • a method 9 for performing repetition may comprise the following steps:
  • the repetition sequence on a time slot or on a plurality of consecutive time slots, wherein at least one of the plurality of consecutive time slots is arranged to at least two of the plurality of repetitions (marked as step 902 );
  • step 903 transmitting, by the user equipment, the plurality of repetitions to a base station (marked as step 903 ).
  • the method 9 for performing repetition may further comprise the following steps:
  • the resource allocation is comprised in a Radio Resource Control (RRC) message or Downlink Control Information (DCI), and the resource allocation comprises at least a Starting symbol Length Indication Value (SLIV) and a repetition number; and
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the method 9 for performing repetition may further comprise the following step: dividing, postponing or dropping, by the user equipment, any one of the plurality of repetitions when the repetition crosses a slot boundary, or when at least one symbol location corresponding to any one of the plurality of repetitions is unusable in the time slot or in the plurality of consecutive time slots.
  • the method 9 for performing repetition may further comprise the following steps: dividing, postponing or dropping, by the user equipment, any one of the plurality of repetitions when the repetition crosses a slot boundary, or when at least one symbol location corresponding to any one of the plurality of repetitions is unusable in the time slot or in the plurality of consecutive time slots; and the user equipment receiving an instruction from the base station and determining whether a semi-static flexible symbol of a symbol location corresponding to any one of the plurality of repetitions is usable based on the instruction.
  • the method 9 for performing repetition may further comprise the following steps:
  • the method 9 for performing repetition may further comprise the following steps:
  • RV Redundancy Version
  • the method 9 for performing repetition may further comprise the following step: performing, by the user equipment, a Redundancy Version mapping to the plurality of repetitions according to a preset rule.
  • the user equipment transmits the plurality of repetitions in a transmission period or across a plurality of transmission periods
  • the repetition sequence is based on configured-grant transmission. Moreover, the plurality of repetitions correspond to the same hybrid automatic repeat request (HARQ) process ID.
  • HARQ hybrid automatic repeat request
  • the repetition sequence is based on configured-grant transmission.
  • the method 9 for performing repetition may further comprise the following steps: receiving, by the user equipment, an HARQ acknowledgement (HARQ ACK) from the base station; and terminating, by the user equipment, the remaining repetitions of the repetition sequence according to the HARQ ACK.
  • HARQ ACK HARQ acknowledgement
  • the HARQ ACK corresponds to one or more HARQ processes.
  • the method 9 for performing repetition may further comprise the following step: stopping, by the user equipment, a configured-grant timer related to the one or more HARQ processes according to the HARQ ACK.
  • the method 9 for performing repetition may be implemented with the user equipment 21 .
  • the way of implementing the method 9 for performing repetition with the user equipment 21 can be directly understood by people having ordinary skill in the art based on the aforesaid descriptions for the user equipment 21 , and therefore will not be further described herein.
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